There's no need for a video game to plant you on a couch. You can get a complete workout. SymGym provides that with an exercise machine that controls a video game. Pump your arms and your legs to move, turn, dodge, punch, and more.
There are already exercise platforms for video games, such as Kinect and Wii. Gizmag explains that SymGym is different because it provides variable resistence based upon situations in a game. For example, heavy objects in the game are heavy in the machine. Running uphill in the game is physically harder on the player. This provides a more realistic gameplay experience.
-via Bit Rebels